C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Egr Valve

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Old Jun 29, 2013 | 11:54 AM
  #1  
Dyno Don L.'s Avatar
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Default Egr Valve

'90 Tune port

Looking for an original GM egr valve NOS or used working.
I have tried to buy a new replacement one and none of them fit right.
The problem is the vacuum line connection comes out of the top and hits the plenum. I have tried grinding the bottom of the plenum and removing the gasket but it still hits.
Any help greatly appreciated.


Last edited by Dyno Don L.; Jun 29, 2013 at 01:06 PM.
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Old Jun 29, 2013 | 02:38 PM
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I gather that the new one differs from the OEM unit in height??

You could defeat the EGR option if desired, unless emissions actually checks its operation in that detail.
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Old Jun 29, 2013 | 05:57 PM
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Rockauto.com has the correct EGR valve on their site.

ACDELCO Part # 2145535 {#17113456, 19210674} One of our most popular parts
[Flag indicates this part fits vehicles sold in the US Market. It does not indicate where the part was made -- manufacturers produce parts in multiple factories worldwide.] [Flag indicates this part fits vehicles sold in the Canadian Market. It does not indicate where the part was made -- manufacturers produce parts in multiple factories worldwide.] VALVE,EGR PROD #17090106

http://tinyurl.com/78v4r2b

No deleting it in SoCal Don is screwed, I used to live there)

Mick
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Old Jun 30, 2013 | 04:16 PM
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I've already bought one of those from Rock Auto...junk right out of the box. No worky.
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Old Jun 30, 2013 | 04:18 PM
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Originally Posted by 65Z01
I gather that the new one differs from the OEM unit in height??
Yes too tall.
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Old Jun 30, 2013 | 04:24 PM
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Yup, the rules in the Republik of Kalifornia combined with the lack of GM parts support for these older cars runs into a multitude of problems. I am running into major problems bringing 93 Camaro back into Kalifornia. The headers are emissions legal but bought before vendors started putting EO plates on the smog legal headers. I am unable to get it smogged as is and no smog legal headers are available that I can find. (the 93 had a slightly different configuration than the 94-97 which is still available).

I do believe the Kalifornia forks are not only doing a visual for the EGR but are running a test to make sure it is working.

Last edited by pkincy; Jun 30, 2013 at 04:29 PM.
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Old Jun 30, 2013 | 05:38 PM
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Originally Posted by Dyno Don L.
I've already bought one of those from Rock Auto...junk right out of the box. No worky.
They sell 4 different EGR valves, I"m sure they will work with you to try to find the correct one for your engine. Have you tried that? If that fails,
maybe this guy will measure his EGR valves to find one that will work. Do you have the original Part Number?
http://tinyurl.com/mombyq6

Last edited by QZRBLU; Jun 30, 2013 at 05:43 PM. Reason: add Ebay link
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Old Jun 30, 2013 | 06:14 PM
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Originally Posted by pkincy
Yup, the rules in the Republik of Kalifornia combined with the lack of GM parts support for these older cars runs into a multitude of problems. I am running into major problems bringing 93 Camaro back into Kalifornia. The headers are emissions legal but bought before vendors started putting EO plates on the smog legal headers. I am unable to get it smogged as is and no smog legal headers are available that I can find. (the 93 had a slightly different configuration than the 94-97 which is still available).

I do believe the Kalifornia forks are not only doing a visual for the EGR but are running a test to make sure it is working.
Smog test requirements vary by county in California. There are counties that do not require any testing. In my area they just asked if the EGR was there. It's buried under the Super Ram plenum so they couldn't find it.
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Old Jul 4, 2013 | 03:37 PM
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Originally Posted by QZRBLU
They sell 4 different EGR valves, I"m sure they will work with you to try to find the correct one for your engine. Have you tried that? If that fails,
maybe this guy will measure his EGR valves to find one that will work. Do you have the original Part Number?
http://tinyurl.com/mombyq6
Thanks for the tip, ordered one.
Looks like the right one, we will see.
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Old Jul 5, 2013 | 12:25 AM
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Make sure you test the EGR valve diaphragm before you install it.

The GM or AC Delco parts seem to be OK, but I have had a bad one right out of the box from AutoZone and I have heard of others with the same issue with a new aftermarket part.
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Old Jul 6, 2013 | 11:51 AM
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That has been happening a lot lately, parts no good right out of the box.
The first valve was a bad diaphragm.
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Old Jul 6, 2013 | 02:21 PM
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I just installed a new Borg Warner unit last month on my 85. It fit perfectly with the new gasket. Never thought that there could be an issue with fitment when the plenum comes down... that's just really poor product design.
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Old Jul 8, 2013 | 04:25 AM
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Originally Posted by Ziggy91
Never thought that there could be an issue with fitment when the plenum comes down... that's just really poor product design.
They're probably trying to make one part fit 47 applications without actually checking to see if they fit.
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Old Jul 8, 2013 | 02:26 PM
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Originally Posted by Cliff Harris
Make sure you test the EGR valve diaphragm before you install it.

The GM or AC Delco parts seem to be OK, but I have had a bad one right out of the box from AutoZone and I have heard of others with the same issue with a new aftermarket part.


For my '87,

I had one from Autozone that the diaphragm tested bad. I took it back and got another. The second one also tested bad plus it was not the right one in the correctly labeled box.

I got an AC Delco from Rock Auto and it worked fine.

Good luck.
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Old Jul 11, 2013 | 05:27 PM
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Im getting ready to change my EGR valve with wire, did anybody have any good news after the replacing there's? on a 1986 L98
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Old Jul 12, 2013 | 03:49 AM
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I just replaced mine about a month ago with a new one from Merle's Automotive Supply and had no problems.
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Old Jul 12, 2013 | 04:54 PM
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ok thank you
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